<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
  <script src="../react18/prop-types.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    class Parent extends React.Component{
      state={
        car:"八手奥拓"
      }
      render(){
        const {car}=this.state
        return (
          <div>
          <h1>我是父组件</h1> 
            <p>我开的车是{car}</p>
            <button onClick={this.changeCarHandle}>股票涨停了，换一辆车</button>
            <hr/>
            <Child a={1} car={car}/>
          </div>
        )
      }
        changeCarHandle = () => {
          this.setState({car:"奥迪RS7"})
        }
   }
      
      class Child extends React.Component{
        render(){
          console.log("Child组件实例",this);
        const {car}=this.props
            return (
              <p>我是儿子组件我开我老子的车{car}</p>
            )
        }

        static propTypes={
          a:PropTypes.number.isRequired,
          car:PropTypes.string
        }
      }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Parent/>)




  </script>
</body>

</html>